Fluid-pressure-brake device



Feb. 10. 1925. 1,525,628

T. H. THOMAS FLUID PRESSURE BRAKE DEVICE Filed March 10, 1924 INVENTOR THOMAS HTI'HOMAS ATTORNEY Patented Feb. 10,

r i PHI-TENT OFFICE;

THOMAS, H. THOMAS, EDGEWOOD; PENNSYLVANIA ASSIGNOR TO THE WESTING- f .HOUSE AIR BRAKE (.3O'IVIJE'AN'Y,.013iWILMIEXRZDIN(Erly PENNSYLVANIA, .A CORPORATION OF-F PENNSYLVANIA.

'.FLUID-PRESSURE-'BRAKE DEVICE.

Application filed MarchdO, 1924:

To all whom it may concern.

'Beit: known-than I, THOMAS H; T-LroMns, a citizen of the:United"States; residing at Edgewood, in the county of'Allegheny and .3 State of P .e1msylvania, have invented new-v and' uSeful improvements in l rluidePressure- Brake-Devices, of which the following; isz'a specification.

This *invention relates to fluid pressure brakes, and more-particularly to meansslfor charging, recharging, and :maintaining the fluid pressure in the brake pipe.

to provide improved the fluid pressure 1111 The principal oh'ect of $111? invention is ineansi for controlling the: brake pipe.

In thaaccOnrpanying drawing, the single figure is a sectional controlllng the fllllCl v1eW ofcap aratusjfor pressure in r the brake pipe and enrhodyin g my invention.

As shown in the drawing, :the apparatus comprises a brake valve device v1 a feed valve :device reservoir 4.

2,2 awbrakeupipea 3,:anda1nain it The brakevalve device l cornprises-a casing having a valve chamber 5, containing "a rotary valve 165% adapted toilbe-soperated by a handle land said casing may alsocontain the usual equalizing 1 mean 8.

discharge valve mecha- The feed valvedevice 21nayco1nprisera casing having a piston .chalnbierstl containing 1 a piston and a valverchaniherx'll, containing a slide valve "12; iThe regulating'porti'olrofthe feed valve devicelnay colnprise'a flexihlediaphragm: 13,

subj ect-on oneside to the pressure of anad-justable coil springtl i and ada'pted to control the operation oha valve 15 interposed between the piston chamber 1 9 and the diaphragm chamber 16.

Said diaphragm chamherzis aopenltma pipe and tpassage. IT-wvhich-Iwilhcallthe feed valve control pipe. and saidrpipe :andr-p'assage leadsgto the-seat of'zt-he rotary-"valve '61 A -teed'valveisupplyr pipe andepassage E8 leads from the seat zozt slide 7' valve. 12 to ctheurotary valve *chamber' 5; gThe-slide valve 12 isprovided With large capacity ports 19 adapted :in the feed position of the slide valvetomegister with corresponding ports' lea supply) pipe-18;

ding to -the teedvalve Serial No; 698,037.

In :operation, when the brake valve handle 7 is turned to release position, as shown in thedrawing,a throughport 20 in the rotary valve 6, connects the rotary valve than: the standard pressures carried in the 1 brake pipe, as determined by: the adjustment ofwthe spring 1 1, the diapl1rag1n"13 vvill be operated by the spring 14; so as to move the valve 15Jtr01n 1ts seat. With the valve 15 seated, and: the valveuchamber 11 charged a through pipe 22 with fluid underrpressure from i the mainr reservoir e 4, :fiuid equalizes 'l'rom valve chamber-r11 into piston chamber 9. through. a. passage: 23 having a restricted port 24:,vsothat piston 101is maintained in the posltion shown in the drawing by spring 25.

WVhenthe valve 15 is unseated fluid under' pressure:isvented from pistonwchaniber 9 toxthefeed: valvecontrol pipe:17 and thence to athezbrake pipe B by way of cavity 21 in the rotary valve 6, :andpiston 10 is then-operated by the higher pressure in valve chamber-11;toshiftitheslide valve 12 so that ports 19 register with the supply ports leading to 'th ewfeedivalve supply pipe 18.: Fluid un-dertpressure flOlll the main reservoi-r l and thewvalve chainher '11 is thus sirppliedzto pipe 18'; and-thenceto: the rotary valve chamber *5. uFronr valve chamher: 5 fluid is supplied 1 through port; 20 to thebrake pipe :lVhen the vapressure in the; brakeapipesand in the diaphragmchamber 16 has been increased to the standard ing, in :Which: =the supply of fluid 1 from the main-reservoirtonthewbrake pipe isvcut oil.

133 connecting :the regulating diaphragm chamber 16 to the brake pipe bynvay of the feed valve control pipe and the brake valve device instead. of at the'teed'valvesupply port leadingvtossthel brake pipe;,. the: opera tion of the regulating subject more nearly to the actual pressure conditions in the brake pipe and this is especially desirable where, as in the present case, the feed valve device is provided with large capacity feed ports, since the more rapid build up of pressure at the feed valve supply port would act on the regulating diaphragm to cause intermittent opening and closing of the feed valve and a consequent delay in effecting the release of the brakes and the recharging of the brake pipe.

With a double end equipment having a brake valve at each end of the car, should the rotary valves of both brake valves be in the handle ofl' position, in which the charging ports are closed, and should leakage occur from the feed valve supply pipe 18, the pressure in the rotary valve chamber might also be reduced and might thus permit the brake pipe pressure acting on the under side of the rotary valve to lift the valve from its seat. In order to prevent this, a restricted port 26 is provided which connects the feed valve supply pipe 18 with the feed control pipe 17. iVith this arrangement, any leakage from the supply pipe 18 will cause a reduction in pressure in the control pipe 17 and thus on the regulating diaphragm 18, so that the feed valve device will then operate to supply fluid under pressure to the supply pipe 18 and thus maintain the pressure in the rotary valve chamber 5.

The piston stem 27 of the piston may be provided with a cylindrical end portion 28 adapted to operate in a guide bushing 29, so as to provide improved wearing conditions and to assist in maintaining the pisston 10 in proper alinement.

Having now described my invent-ion, what I claim as new and desire to secure by Letters Patent, is

1. In a fluid pressure brake apparatus, the combination with a brake pipe, of a feed valve device comprising a supply port-ion for controlling the supply of fluid under pressure to the brake pipe and a regulating portion subject to brake pipe pressure supplied from a point remote to the feed valve device for controlling the operation of said supply portion.

2. I11 afluid pressure brake apparatus, the combination with a brake pipe and a brake valve device, of a feed valve device, operated according to the pressure of fluid in the brake pipe as supplied at said brake valve device for controlling the supply of fluid under pressure to the brake pipe.

3. In a fluid pressure brake apparatus, the combination with a brake pipe and a brake valve device, of a feed valve device comprising a supply portion for controlling the supply of fluid under pressure to the brake pipe, a regulating portion subject to brake diaphragm will be pipe pressure for controlling the operation of said supply portion, and means controlled by said brake valve device for connecting the brake pipe to said regulating portion.

4. In a fluid pressure brake apparatus, the combination with a brake pipe and a brake valve device, of a feed valve control pipe, a feed valve device operated upon a reduction in pressure in said control pipe for supplying fluid under pressure to the brake pipe, and means controlled by said brake valve device for connecting the brake pipe to said control pipe.

5. In a fluid pressure brake apparatus, the combination with abrake pipe, of a feed valve control pipe, a feed valve device 0p erated according to the pressure in said control pipe for controlling the supply of fluid under pressure to said brake pipe, and a brake valve device having a rotary valve adapted in release position to connect the brake pipe with said control pipe.

6. In a fluid pressure brake apparatus, the combination with a brake pipe and a brake valve device having a valve chamber containing a rotary valve, of a feed valve control pipe, and a feed valve supply pipe, a feed valve device operated upon a reduction in pressure in said control pipe for supplying fluid under pressure to the feed valve supply pipe, said control pipe and said feed valve supply pipe being constantly connected through a communicating passage.

7. In a fluid pressure brake apparatus, the combination with a brake pipe and a brake valve device having a valve chamber eontaining a rotary valve, of a feed valve control pipe, and a feed valve supply pipe, a feed valve device operated upon a reduction in pressure in said cont-r01 pipe for supplying fluid under pressure to the feed valve supply pipe, said control pipe and said feed valve supply pipe being constantly connected through a restricted passage.

8. In a fluid pressure brake apparatus, the combination with a brake pipe, of a -l'eed valve control pipe, a feed valve supply pipe, a feed valve device operated upon a reduction in feed valve control pipe pressure for supplying fluid under pressure to said supply pipe, a brake valve device having a posi-- tion for connecting said supply pipe to th brake pipe, and a passage constantly con necting said supply pipe to said control pipe.

9. In a fluid pressure brake apparatus, the combination with a brake pipe, oi a feed valve control pipe, a feed valve supply pipe, a feed valve device operated upon a reduction in feed valve control pipe pressure for supplying fluid under pressure to said supply pipe, and a brake valve device having a rotary valve adapted in one position to connect said supply pipe to the brake pipe, and the brake pipe to said control pipe.

10,111 a fluid pressure brake apparatus,

the combination With abrake pipe, of a feed valve control pipe, a feed valve. supply pipe, a feed valve device operated upon a reduction in feed valve control pipe pressure for supplying fluid under pressure to said supply pipe, and a brake valve device having a rotary valve provlded with means adapted pipe.

In testimony whereof I have hereunto set my hand.

THOMAS H. THOMAS. 

